<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
	<title></title>
</head>
<script type="text/javascript">
var str = '<div>这里是div<p>里面的段落</p></div>';
var reg = 	
var str = '<div>这里是div<p>里面的段落</p></div>';
alert(str.replace(reg,''));
</script>

</script>
<body>

</body>
</html>